Why did the first world war start in 1914?

Related questions

1. When did ww1 start and why?
2. Why are medals worn on the left side?
3. How did World war1 end?
4. How many people were killed by guns in ww1?
5. Why did Serbia kill the Archduke?
6. Why was Archduke Ferdinand assassinated?
7. Why did Gavrilo Princip assassinate Franz Ferdinand?
8. Who decided ww1 end?
9. WHO declared World War 1?
10. How much did Germany pay after ww1?

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21. #princip